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Units should not automatically attack aliens if moved into an unexplored hex

Units should not automatically attack aliens if moved into an unexplored hex. I try my best not to antagonize the aliens in the beginning, but it is frustrating when I move a unit to a seemingly empty hex only to find out that an alien was there (usually for units 2 hexs away). I can understand you automatically attacking aliens, if you know there is something there, however, you should be given a warning if there isn't. Especially for units like explorers that aren't meant for offensive combat.

That is a danger in clicking two tile movement, where you can't actually see two tiles away. If you get into the habit of directing units to move only one tile at a time (it takes maybe one game to make the habit second nature), you cannot possibly inadvertently attack any aliens.